The G7 leaders posed for the landmark "family photo" in Carbis Bay, England ahead of the first plenary session of the three-day summit.
It's a major moment for President Biden, who has been near the center of the American foreign policy establishment for decades but never as a member of the world leaders’ club.
On Friday, he took his place alongside the leaders of the United Kingdom, France, Germany, Italy, Japan, Canada and the European Union to pose for a photo marking the start of the G7 summit. Biden posed to the right of Johnson during the photo.
Biden was seen in friendly conversation with President Emmanuel Macron of France and Prime Minister Justin Trudeau of Canada as he walked to the platform. As the leaders were returning inside after the photo was taken, Biden walked arm-in-arm with Macron, whom he had not yet met as president.
More on today's agenda: The leaders of the world's advanced economies are gathering today on the Cornish coast for the first time since the global coronavirus pandemic began, welcoming Biden as a new member who arrived here intent on restoring traditional American alliances.
The global economy is up first in the summit, with the global tax rate and aid for countries in need on the docket. These efforts, the White House said, will "forge a more fair and inclusive global economy" as the world leaders gather in Cornwall.
Biden and the G7 leaders, the White House said, will "discuss ways to forge a more fair, sustainable, and inclusive global economy that meets the unique challenges of our time. President Biden and G7 partners are committed to a global recovery that benefits the middle class and working families at home and around the world."
The group is expected to announce an endorsement for the global minimum tax of at least 15%, a Biden-led overhaul of the global tax system, after Treasury Secretary Janet Yellen and her finance minister counterparts announced an agreement on the matter earlier this month in London.
Watch the historic moment here: